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Simplify Away Quadruple Extension

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Passed non-regression VVLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 90792 W: 23155 L: 23018 D: 44619
Ptnml(0-2): 6, 8406, 28432, 8549, 3
https://tests.stockfishchess.org/tests/view/664ffa4ca86388d5e27d8e7a

Passed non-regression VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 288136 W: 72608 L: 72659 D: 142869
Ptnml(0-2): 38, 30258, 83525, 30211, 36
https://tests.stockfishchess.org/tests/view/66551609a86388d5e27db9ae

closes https://github.com/official-stockfish/Stockfish/pull/5293

bench 1501735
This commit is contained in:
Shawn Xu 2024-05-23 19:22:41 -07:00 • committed by Joost VandeVondele
parent 3c62ad7e07
commit 4a2291ed33
1 changed files with 1 additions and 3 deletions
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4
src/search.cpp
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@ -1066,11 +1066,9 @@ moves_loop: // When in check, search starts here
{
int doubleMargin = 304 * PvNode - 203 * !ttCapture;
int tripleMargin = 117 + 259 * PvNode - 296 * !ttCapture + 97 * ss->ttPv;
int quadMargin = 486 + 343 * PvNode - 273 * !ttCapture + 232 * ss->ttPv;
extension = 1 + (value < singularBeta - doubleMargin)
+ (value < singularBeta - tripleMargin)
+ (value < singularBeta - quadMargin);
+ (value < singularBeta - tripleMargin);
depth += ((!PvNode) && (depth < 16));
}